137 lines
4.7 KiB
Markdown
137 lines
4.7 KiB
Markdown
---
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title: sssd
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---
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## What is sssd
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From https://sssd.io/
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:::note
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**SSSD** is an acronym for System Security Services Daemon. It is the client component of centralized identity management solutions such as FreeIPA, 389 Directory Server, Microsoft Active Directory, OpenLDAP and other directory servers. The client serves and caches the information stored in the remote directory server and provides identity, authentication and authorization services to the host machine.
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:::
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Note that authentik supports _only_ user and group objects. As
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a consequence, it cannot be used to provide automount or sudo
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configuration nor can it provide netgroups or services to `nss`.
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Kerberos is also not supported.
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## Preperation
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The following placeholders will be used:
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- `authentik.company` is the FQDN of the authentik install.
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- `ldap.baseDN` is the Base DN you configure in the LDAP provider.
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- `ldap.domain` is (typically) an FQDN for your domain. Usually
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it is just the components of your base DN. For example, if
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`ldap.baseDN` is `dc=ldap,dc=goauthentik,dc=io` then the domain
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might be `ldap.goauthentik.io`.
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- `ldap.searchGroup` is the "Search Group" that can can see all
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users and groups in authentik.
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- `sssd.serviceAccount` is a service account created in authentik
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- `sssd.serviceAccountToken` is the service account token generated
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by authentik.
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Create an LDAP Provider if you don't already have one setup.
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This guide assumes you will be running with TLS and that you've
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correctly setup certificates both in authentik and on the host
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running sssd. See the [ldap provider docs](../../../docs/providers/ldap) for setting up SSL on the authentik side.
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Remember the Base DN you have configured for the provider as you'll
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need it in the sssd configuration.
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Create a new service account for all of your hosts to use to connect
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to LDAP and perform searches. Make sure this service account is added
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to `ldap.searchGroup`.
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## Deployment
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Create an outpost deployment for the provider you've created above, as described [here](../../../docs/outposts/). Deploy this Outpost either on the same host or a different host that your
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host(s) running sssd can access.
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The outpost will connect to authentik and configure itself.
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## Client Configuration
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First, install the necessary sssd packages on your host. Very likely
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the package is just `sssd`.
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:::note
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This guide well help you configure the `sssd.conf` for LDAP only. You
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will likely need to perform other tasks for a usable setup
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like setting up automounted or autocreated home directories that
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are beyond the scope of this guide. See the "additional resources"
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section for some help.
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:::
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Create a file at `/etc/sssd/sssd.conf` with contents similar to
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the following:
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```ini
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[nss]
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filter_groups = root
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filter_users = root
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reconnection_retries = 3
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[sssd]
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config_file_version = 2
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reconnection_retries = 3
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sbus_timeout = 30
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domains = ${ldap.domain}
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services = nss, pam, ssh
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[pam]
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reconnection_retries = 3
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[domain/${ldap.domain}]
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cache_credentials = True
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id_provider = ldap
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chpass_provider = ldap
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auth_provider = ldap
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access_provider = ldap
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ldap_uri = ldaps://${authentik.company}:636
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ldap_schema = rfc2307bis
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ldap_search_base = ${ldap.baseDN}
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ldap_user_search_base = ou=users,${ldap.baseDN}
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ldap_group_search_base = ${ldap.baseDN}
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ldap_user_object_class = user
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ldap_user_name = cn
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ldap_group_object_class = group
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ldap_group_name = cn
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# Optionally, filter logins to only a specific group
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#ldap_access_order = filter
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#ldap_access_filter = memberOf=cn=authentik Admins,ou=groups,${ldap.baseDN}
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ldap_default_bind_dn = cn=${sssd.serviceAccount},ou=users,${ldap.baseDN}
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ldap_default_authtok = ${sssd.serviceAccountToken}
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```
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You should now be able to start sssd; however, the system may not
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yet be setup to use it. Depending on your platform, you may need to
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use `authconfig` or `pam-auth-update` to configure your system. See
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the additional resources section for details.
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:::note
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You can store SSH authorized keys in LDAP by adding the
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`sshPublicKey` attribute to any user with their public key as
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the value.
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:::
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## Additional Resources
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The setup of sssd may vary based on Linux distribution and version,
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here are some resources that can help you get this setup:
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:::note
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authentik is providing a simple LDAP server, not an Active Directory
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domain. Be sure you're looking at the correct sections in these guides.
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:::
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- https://sssd.io/docs/quick-start.html#quick-start-ldap
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- https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/7/html/system-level_authentication_guide/configuring_services
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- https://ubuntu.com/server/docs/service-sssd
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- https://manpages.debian.org/unstable/sssd-ldap/sssd-ldap.5.en.html
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- https://wiki.archlinux.org/title/LDAP_authentication
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